摘要
提出亚微秒单脉冲应力波载荷作用下Ⅱ型裂纹的平板冲击实验技术 .加载率为dK dt～ 10 8MPa·m1 2 ·s-1.实验中由锰铜应力片和弹性波理论分别测定和计算了压应力 ;通过微观分析确定了动态裂纹的平均扩展长度 ;引进等效应力强度因子 ,用动态断裂理论确定了 6 0 #钢的动态断裂韧性KⅠd和KⅡd ;
An improved plate impact experimental technique is presented at present study for studying dynamic fracture processes of the model Ⅱ crack, which have occurred under sub-microsecond single stress pulse loading. The loading rate achieved is dK/dt～ MPa·m 1/2·s -1. Under the loading conditions, the compressive stresses are measured by using Mn-Cu stress gages technique, and the average lengths of crack advanced are determined from the fractograph of fracture surfaces. By introducing the equivalent stress intensity factors, the dynamic fracture toughness, K Ⅰd and K Ⅱd, are estimated from the initiation time determined by the elasto-dynamic modeling of the crack advance. A universal testing method, by which the dynamic fracture toughness of material can be accurately determined, has been established.
出处
《固体力学学报》
CAS
CSCD
北大核心
2002年第1期18-23,共6页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金重点资助项目 (5 9836 2 2 0)
关键词
单脉冲应力波
动态断裂韧性
压-剪复合应力波
平板冲击实验
锰铜应片
single pulse, equivalent stress intensity factors, dynamic fracture toughness, compressive-shear combined stress wave, pressure-shear gun
